RESEARCH SUMMARY

  • Title: Rate of torque and electromyographic development during anticipated eccentric contraction is lower in previously strained hamstrings

  • Author/s: Opar (@davidopar), Williams (@drmorgs), Timmins (@ryan_timmins), Dear, Shield (@das_shield)

  • Year: 2013

  • Question: Does prior injury have an effect on myoelectrical activity of the hamstrings during tasks requiring high rates of torque development?

  • Key Takeaway: Previous HSI does indeed have a negative effect on RTD and impulse, with myoelectrical activity reductions interestingly confined to the biceps femoris long head (BFlh).

  • Summary: Recreational athletes with a history of unilateral HSI participate in an isokinetic dynamometry protocol with sEMG taken as a measurement.

    Key Findings: 

    • Previously injured hamstrings displayed lower rates of torque development and impulse during slow maximal eccentric contraction compared to their contralateral uninjured limb
    • Lower myoelectrical activity was confined to the biceps femoris long head.
    • Regardless of whether these deficits are the cause of or the result of injury, these findings could have important implications for hamstring strain injury and re-injury.